(PHP 4 >= 4.0.5, PECL vpopmail >= 0.2) Change a virtual user's password

(PHP 4 >= 4.0.5, PECL vpopmail >= 0.2) Delete a virtual domain

(PHP 4 >= 4.1.0, PECL cyrus 1.0) Authenticate against a Cyrus IMAP server

(PHP 4, PHP 5, PHP 7) Send mail bool mail ( string

(PECL mailparse >= 0.9.0) Gets the best way of encoding

(PHP 4, PHP 5, PHP 7) Returns the list of mailboxes that matches the given text

(PHP 4 >= 4.1.0, PECL cyrus 1.0) Send a query to a Cyrus IMAP server

(PHP 4 >= 4.1.0, PECL cyrus 1.0) Connect to a Cyrus IMAP server

(PHP 4, PHP 5, PHP 7) Convert an 8bit string to a base64 string

(PHP 4, PHP 5, PHP 7) This function returns an array of messages matching the given search criteria